Sealing/caulking toilet on a tile floor?

In cleaning a bathroom floor recently, I wound up essentially removing much of the caulk around the base of the toilet.
As the toilet is right near the shower, and there is a good deal of water splash outside the shower stall, it's necessary to have some kind of seal around the toilet base, to protect from leakage.
But when I put down new caulk, it just didn't adhere. This is caulk I've used to seal tubs, shower stalls, etc. What am I doing wrong? It's a "regular" toilet, and the floor is one of those late-70s era floors with little slippery tiles and grout in between.
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wrote:

Most likely some cleaning residue on the tile.
sdb
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trader-of-some-jacks wrote:

I would be willing to bet that the old caulk was silicone. If that was the case, then you will have to use silicone to replace it as the silicone leaves a residue that nothing else will adhere to. That is one of the many reasons that I never use silicone except on glass.
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